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Getting distinct values from object array in MongoDB?
To get distinct values from object array in MongoDB, use distinct(). Let us create a collection with documents −
> db.demo442.insertOne(
... {
...
... "Information" : [
... {
... "FirstName" : "John",
... "Age" : 21
... },
... {
... "FirstName" : "Sam",
... "Age" : 23
... },
... {
... "FirstName" : "John",
... "Age" : 24
... },
... {
... "FirstName" : "Carol",
... "Age" : 20
... },
... {
... "FirstName" : "Sam",
... "Age" : 22
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e78cf29bbc41e36cc3caeb8")
}Display all documents from a collection with the help of find() method −
> db.demo442.find();
This will produce the following output −
{ "_id" : ObjectId("5e78cf29bbc41e36cc3caeb8"), "Information" : [ { "FirstName" : "John", "Age" : 21 }, { "FirstName" : "Sam", "Age" : 23 }, { "FirstName" : "John", "Age" : 24 }, { "FirstName" : "Carol", "Age" : 20 }, { "FirstName" : "Sam", "Age" : 22 } ] }Following is the query to get distinct values from object array in MongoDB −
> db.demo442.distinct("Information.FirstName");This will produce the following output −
[ "Carol", "John", "Sam" ]
Updated on: 06-Apr-2020
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